Explain the following guiding principles in the use of microphones :
a. Placement
b. balance
c. Separation
d. Perspective 

a. placement -

Correct microphone positioning is one of the most important ways to enhance recognition accuracy. Even slight variations can deteriorate accuracy significantly.

Positioning a headset microphone

• Place the microphone element to the side of your mouth to avoid noise from breathing.
• Keep the microphone element about an inch from the side of your mouth, but not touching it.
• Make sure the front ___ ________ ___ _____ ____ ____ ______ _______ _______ ____.
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